diff --git a/deepsearch/cps/cli/data_indices_typer.py b/deepsearch/cps/cli/data_indices_typer.py
index 3c735a21..ade0f569 100644
--- a/deepsearch/cps/cli/data_indices_typer.py
+++ b/deepsearch/cps/cli/data_indices_typer.py
@@ -150,7 +150,7 @@ def upload_files(
     cos_coordinates: Optional[S3Coordinates] = None
     if s3_coordinates is not None:
         try:
-            cos_coordinates = json.load(open(s3_coordinates))
+            cos_coordinates = S3Coordinates.parse_file(s3_coordinates)
         except Exception as e:
             typer.echo(f"Error occurred: {e}")
             typer.echo(ERROR_MSG)
diff --git a/deepsearch/cps/client/components/data_indices.py b/deepsearch/cps/client/components/data_indices.py
index fe5c351b..a5f04bd1 100644
--- a/deepsearch/cps/client/components/data_indices.py
+++ b/deepsearch/cps/client/components/data_indices.py
@@ -102,7 +102,7 @@ def delete(
     def upload_file(
         self,
         coords: ElasticProjectDataCollectionSource,
-        body: Union[Dict[str, List[str]], Dict[str, Dict[str, S3Coordinates]]],
+        body: Union[Dict[str, List[str]], Dict[str, Dict[str, Dict]]],
     ) -> str:
         """
         Call api for converting and uploading file to a project's data index.
diff --git a/deepsearch/cps/data_indices/utils.py b/deepsearch/cps/data_indices/utils.py
index a8ca44ce..53058035 100644
--- a/deepsearch/cps/data_indices/utils.py
+++ b/deepsearch/cps/data_indices/utils.py
@@ -183,7 +183,7 @@ def process_external_cos(
         bar_format=progressbar.bar_format,
     ) as progress:
         # upload using coordinates
-        payload = {"s3_source": {"coordinates": s3_coordinates}}
+        payload = {"s3_source": {"coordinates": s3_coordinates.dict()}}
         task_id = api.data_indices.upload_file(
             coords=coords,
             body=payload,
diff --git a/docs/guide/data_indices.md b/docs/guide/data_indices.md
index 12394ecc..3a81a591 100644
--- a/docs/guide/data_indices.md
+++ b/docs/guide/data_indices.md
@@ -102,6 +102,9 @@ Documents can be converted and added, directly, to a data index in a project. Br
 
     // for online documents
     $ deepsearch cps data-indices upload -p PROJ_KEY -x INDEX_KEY -u PATH_URL
+
+    // for COS documents
+    $ deepsearch cps data-indices upload -p PROJ_KEY -x INDEX_KEY -c PATH_COS_COORDINATES
     ```
 
     </div>
@@ -124,6 +127,11 @@ Documents can be converted and added, directly, to a data index in a project. Br
     #input_urls = ["https:///URL1", "https://URL2", "https://URL3"]
 
     data_indices_utils.upload_files(api=api, coords=coords, url=input_urls)
+
+    # For COS documents
+    cos_coordinates = S3Coordinates.parse_file(s3_coordinates)
+
+    data_indices_utils.upload_files(api=api, coords=coords, s3_coordinates=cos_coordinates)
     ```
 
 ---